Supposedly one of the reasons they did so many reshoots was because the original ending was too similar to a couple of the Marvel Studio movies. Also, at some point during production, it must have become clear that Fox was selling the property to Disney and the characters would be taken over by Marvel Studios. Seems like that might have dampened enthusiasm for it.
I expect the X-Universe will be rebooted again, this time in the Marvel Cinematic Universe where they will be integrated with the rest of the Marvel cast. Given how Fox let the property fizzle out, I don’t imagine Marvel will make the new interpretation anytime soon. In the same deal Disney acquired rights to the Fantastic Four. Rumor has it tentative plans are to introduce the FF sometime in 2022.
And you have to believe that Marvel will adapt the Secret Wars saga. It can be constructed similarly to the Infinity Saga...20 movies leading up to an Endgame-like conclusion. And Secret Wars wouldn’t be Secret Wars without the X-Men.
There is one more Fox X-movie yet to be released: The New Mutants. It was finished quite a while ago, and no one seems to know why it hasn’t been released. I’m guessing the reason for the delay is that it’s just not very good.
Did you see the attempted reboot of the Fantastic Four? Diversity politics was more important than the story.
I actually liked the two Fantastic Four Movies they made prior to the last reboot. (2005, 2007). The 2015 reboot sucked.